Seiko Cal. 6636 - 437

The Seiko 6636-437 represents an important milestone in Seiko's 1980 lineup. With its 18mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-4bb5df80243b]

Also known as: Monster, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Silver

Jewels

17j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1980

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